Skeletal Radiology

, Volume 36, Issue 6, pp 495–502

Shoulder MR arthrography of the posterior labrocapsular complex in overhead throwers with pathologic internal impingement and internal rotation deficit

  • Michael J. Tuite
  • Brian D. Petersen
  • Steven M. Wise
  • Jason P. Fine
  • Lee D. Kaplan
  • John F. Orwin
Scientific Article

DOI: 10.1007/s00256-007-0278-6

Cite this article as:
Tuite, M.J., Petersen, B.D., Wise, S.M. et al. Skeletal Radiol (2007) 36: 495. doi:10.1007/s00256-007-0278-6

Abstract

Purpose

To determine if overhead-throwing athletes with internal impingement pain and internal rotation deficit have thickening of the posterior inferior labrocapsular complex on MR arthrogram images.

Materials and methods

This study was approved and a waiver of consent granted by our institutional review board. Twenty-six overhead-throwing athletes with internal impingement pain and internal rotation deficit, and 26 controls who had undergone MR arthrograms, were retrospectively examined. The MR studies were combined and read in a blind fashion. On an axial image through the posteroinferior glenoid rim, the readers measured the labral length, capsule-labrum length, and the posterior recess angle. A t-test was used to determine statistical significance.

Results

The mean labral length was 4.9 mm [standard deviation (SD) 1.4 mm] for the controls, and 6.4 mm (SD 1.6 mm) for the athletes (P = 0.001). The mean capsule-labrum length was 5.4 mm (SD 2.1 mm) for the controls, and 8.8 mm (SD 2.9 mm) for the athletes (P < 0.001). The mean posterior recess angle measured 65° (SD 27°) for the controls and 94° (SD 38°) for the athletes (P = 0.002).

Conclusions

Overhead-throwing athletes with internal impingement pain and internal rotation deficit tend to have a thicker labrum and a shallower capsular recess in the posterior inferior shoulder joint than do non-overhead-throwing athletes. In many, the posteroinferior capsule is also thickened. These MR findings should alert the radiologist to closely inspect the posterior cuff and posterosuperior labrum for the tears associated with internal impingement.

Keywords

ShoulderMRIOverhead-throwing athletic injuries

Copyright information

© ISS 2007

Authors and Affiliations

  • Michael J. Tuite
    • 1
  • Brian D. Petersen
    • 1
  • Steven M. Wise
    • 1
  • Jason P. Fine
    • 2
  • Lee D. Kaplan
    • 3
  • John F. Orwin
    • 3
  1. 1.Department of RadiologyUniversity of Wisconsin Hospital and ClinicsMadisonUSA
  2. 2.Department of BiostatisticsUniversity of Wisconsin Hospital and ClinicsMadisonUSA
  3. 3.Department of Orthopedic SurgeryUniversity of Wisconsin Hospital and ClinicsMadisonUSA